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首页> 外文会议>Conference on Algorithms and Systems for Optical Information Processing Ⅴ Jul 31-Aug 2, 2001, San Diego, USA >Implementation of phase-only coded ternary niters for filtering-based optical processors
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Implementation of phase-only coded ternary niters for filtering-based optical processors

机译：基于相位的三元编码器的实现，用于基于滤波的光学处理器

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摘要

This paper addresses a method to implement ternary filters with binary phase spatial light modulators (SLMs) for real- time optical pattern recognition applications using a filtering-based optical processor. A complex ternary filter can be considered as a binary phase function multiplied by a binary amplitude filter, which selects information by blocking or letting pass spatial frequencies. The main problem is that commercially available SLMs cannot provide amplitude and phase modulation at the same time and at high filtering rates. The method presented here involves coding the binary amplitude in phase only, by adding a linear phase to the frequencies representing undesired information. This information will be rejected outside the correlation plane, whereas useful information will pass without alteration. Computer simulations and experimental results have been obtained for different applications. These results show that the pure phase filters obtained are absolutely equivalent to the desired ternary filters and, furthermore, that any ternary filtering function can be easily implemented in a VanderLugt correlator that uses a binary phase SLM, thanks to this technique.
机译：本文提出了一种方法，该方法使用基于滤波的光学处理器，通过二进制相位空间光调制器（SLM）实现三元滤波器，用于实时光学模式识别应用。复数三进制滤波器可以看作是二进制相位函数乘以二进制幅度滤波器，后者通过阻塞或让空间频率通过来选择信息。主要问题在于，商用SLM无法同时以高滤波速率提供幅度和相位调制。此处介绍的方法涉及通过对表示不希望的信息的频率添加线性相位，仅对相位的二进制幅度进行编码。该信息将在相关平面之外被拒绝，而有用的信息将通过而不进行更改。已针对不同的应用获得了计算机模拟和实验结果。这些结果表明，所获得的纯相位滤波器绝对等于所需的三元滤波器，此外，由于这种技术，任何三元滤波功能都可以在使用二进制相位SLM的VanderLugt相关器中轻松实现。

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